PostRowsInGroups is giving badRequest from Json object

[daveParso]

I have the following code to create a json object and then post this to a streaming dataset in powerBI. With the code i have so far i seem to be finding the dataset and table just fine but i am getting a badrequest on my json object. Is there something simple im missing in the code below that is preventing this from working?

using (var client = new PowerBIClient(new Uri(ApiUrl), tokenCredentials))
{
    var payload = new testValues
    {
        value1 = "test",
        value2 = counter,
        value3 = DateTime.UtcNow
    };
    string stringPayload = JsonConvert.SerializeObject(payload);
    StringContent postContent = new StringContent(stringPayload, Encoding.UTF8, "application/json");
            
    ODataResponseListDataset datasets = client.Datasets.GetDatasetsInGroup(GroupId);
    client.Datasets.PostRowsInGroup(GroupId, datasets.Value.LastOrDefault().Id, "RealTimeData", postContent);
    counter++;
    return;
}

and below is the testValues class just incase that can also shed some light on my issue here:

public class testValues
{
    [JsonProperty("value1")]
    public string value1 { get; set; }

    [JsonProperty("value2")]
    public int value2 { get; set; }

    [JsonProperty("value3")]
    public DateTime value3 { get; set; }
}

[Eric_Zhang · Accepted solution]

@daveParso

You can add try..catch blocks to get the bad request details.

try
                {
                    client.Datasets.PostRowsInGroup(groupId, yourdatesetid, "RealTimeData", dataObj);
                }
catch (HttpOperationException ex)
               { 
                    //Bad Request
                    var content = ex.Response.Content;
                    Console.WriteLine(content); 
                }

Based on my test, my below demo work.

        static void Main(string[] args)
        {
            var credentials = new TokenCredentials(accessToken);
            using (var client = new PowerBIClient( credentials))
            {
                var payload = new testValues
                {
                    value1 = "test",
                    value2 = 1,
                    value3 = DateTime.UtcNow
                   // value3 = DateTime.UtcNow.ToString("s") + "Z"
                };

                IList<testValues> list = new List<testValues>();

                list.Add(payload);

                var stringPayload = JsonConvert.SerializeObject(list);
                object dataObj = Newtonsoft.Json.JsonConvert.DeserializeObject<Object>(stringPayload.ToString());
                //StringContent postContent = new StringContent(stringPayload, Encoding.UTF8, "application/json");
                try
                {
                    client.Datasets.PostRowsInGroup(groupId,datasetId, "RealTimeData", dataObj);
                }
                catch (HttpOperationException ex)
               { 
                    //Bad Request
                    var content = ex.Response.Content;
                    Console.WriteLine(content); 
                }
                 
            }

            Console.WriteLine("Done");
            Console.ReadKey();

        }